Place the toilet tank lid off to the side so it does not get in your way while you are doing the toilet bowl repairs. Now you should flush the toilet with the water being off so the toilet tank empties and you can work on the toilet chain and the flapper. You first will want to remove the chain from the toilet handle.
Definition of vat. 1  1 : a large vessel (such as a cistern, tub, or barrel) especially for holding liquors in an immature state or preparations for dyeing or tanning.
VAT is similar to the retail sales tax, but it is imposed at every stage of the production and sales process. VAT varies from one country to the other, but the idea is to curb tax evasion and give government a way to raise revenues.